This unique, 83 story high-rise hotel condominium building in Chicago, designed by Studio Gang Architects and Loewenberg Architects, was completed at the end of 2009. A 225 room hotel fills most of the base and the first 18 floors of the tower. Above that, there are 31 floors of apartments and 28 floors of condominiums. There are also five levels of parking.

An interesting feature of the design is the use of different glass shading qualities depending on the degree of balcony overhang. Energy modeling was that much more complex as a result. Purchased chilled water keeps cooling energy costs low but also adds to the complexity of modeling.